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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '855baab5ec1381f8d93fae4939cc7b270382be421e131173414b38e1af9ab335' 
  AND token = 'm900+BGYuUWG5kDF20VUbIygF73IT/JgJpvjYtZYI3Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00107

JSON explain

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