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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af9f42680122ce0838648392ea8f72b8f126262b80d8e2fc780cf2aaf36e0c94' 
  AND token = 'vHcLhzWcDjUYCAng14ygoUeVnIcdcZusYPGOWiXh74w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00180

JSON explain

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