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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c65a1b15d105e897adbe7602015475cb5fd6caa191842f4204d9f5a59a1d33fd' 
  AND token = 'Jf1Vg0uTcAokwH7LzLLD6Ex6MSgnOUGPiu0TMg7gPxE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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