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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd9ca7d85a0976781342c4d768ca4f9454f9559c71e7e5cbd20a78054f1e7743' 
  AND token = 'Xs7QzywAWWJJW9mOCMPUDIL6G9ANJx/dnvmddci+p5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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