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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '386f3d133f6f2ce5e5dcab3df3619c6741b478c797e6b1685670b0dc0dba72f4' 
  AND token = 'u963X0KO3xbkn97m6uVl2leROhUiV9QbJ5u/Xxd+vaY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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