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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddb3065b7ba9f3928379415b7567cd73b953179a0997eed629edc06acf8117ad' 
  AND token = 'HG2cTlrnvpFuDF0JGjwA1K1Dj5kfqwd2lwweD3khjFs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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