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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc6df186a2e3a6f6c3f409880b1c458435eefd93c6d044cc20f6e69dd5bec101' 
  AND token = 'W+qCEeQtrd+uzmXP2vQ9kbdAriBUS3XRtpFSj1u+J2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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