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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c1db5d5d4d0238443aef93acf72a82bb14d506d653929a60221d56c364d5811' 
  AND token = 'lX9dpOttmU5+IepxpAcCYtS5Yy3LW794XSwyTtoB5II=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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