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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57e89678181ff4cd0e76aed601e3df9ff3f401d8f20193bda8e5939a25b703f0' 
  AND token = 'hF0xpWK2YDdpBlOTFQmtNNqaWKT8Od9KF3K0NrKaebU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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