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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce1cef97e30ac4cb4089b4253ef0b682ed1e3a507a3c67e9031483a95825b40b' 
  AND token = 'i4t4P4qNgHEgGJHWNnHSjNihVrh6eLQ52SQSBRmyuKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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