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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce9ed5cdd745d894b1b708939ed1cb9ac6b327aec7f18d6b2b6939bd1b9c2b2e' 
  AND token = 'dXoXmZhzewtiBdglxYDu6V5EnThu2X3oJntHrX2neKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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