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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '766eeba29a7dd1e8b79ac0968b48a35a235f7d8af1b35eafcd561642bcb148b9' 
  AND token = 't71zieQ16oMv1VIrxElUbYlaiivIEsOIt1gnBZKF8Zk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.02022

JSON explain

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