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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '402e407e01ab8c437cb32d738589c4dd258711c29e1443e93d712f7ad58fc83e' 
  AND token = 'Q2POuC2QNPYtQEjJA8CmZK/e4jH2SlsHq9VsPfGFwsM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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