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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44614da2bb820a1fbda9aa3ce6b3996e76b715a3e43062419143840500104ed0' 
  AND token = 'FkWAWyuernV+hzy7MqNaA9n0ugaqtrZJGFWihdub0u8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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