SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f214512f3404b1aa6f05b9095a75341c2464633a81b64d832288460eff32b38d' 
  AND token = '+emdNfjrFiFClL1j40gZKDnj/3/uXASU9XGYfJVmkSY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00111

JSON explain

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