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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74cedbdb674013925c7f7c46b831ddd0591118a747ebda3fd795ae3f9ae277d8' 
  AND token = 'vuMZm9gONFyG98/BS7vn78W0efAIUdSqrz58D9m9HFI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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