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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3344eded2f622a5e591abd36b67d4af6c46568adb1974bdb52df3562b433faa' 
  AND token = 'bk+XfPfD11vtwpPwgpoe1dESzUYMsskBG8AFV2hN6/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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