SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8af61274e3efb5adc6d33f17249b1700a7cac4a498616b4fcc3a5c603a9b7d3' 
  AND token = 'qm8k2BoIA0ysmCvjxWcKPimY8imm/r5RoUwwUG3v+To=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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