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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48e6310cbb29519cf3abf954570aec2b19f3b83be64684b2a753f2e6e365fb98' 
  AND token = 'tErtQrGCSHcXkNz5UZIC5Gn412VAj71v59h2b/jS47I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00145

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}