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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5da53e7e85af853a6fd5b6b3c5333df761fda54077ae60261ccd9b23974947b5' 
  AND token = 'mdvps1EBI2DcwJPB1lw6OUtvcL3fFt8ouypnxQHGQxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00091

JSON explain

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