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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '961bdcab82a9dae9261d4caa22c6dfc8ab957c3cdb7812afbdce3e00998dbe02' 
  AND token = 'HSfTBIGEbIAFg3M3txiEu1iloBrMDRA4B2zxof+mFnQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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