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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3840492d78f41ee277b0db3e03e6dd9f3dcbced1a69b2f919419a0b37c12184d' 
  AND token = '+Lr2IVA3bnwSSfTJmZzVAEUKZHQfXrckEkgMPUHP7a8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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