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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57dc8608ee217c2641f63578979bba4c38a30e6400be2298e06dfb18ef11a368' 
  AND token = 'FUz7IrB2xpjedjx0Yta1Cw0RizIJs8yNjkNlIr9vNRw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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