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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c63e4cdedba3724e3cf54dce8a9758d8fcffaa61499a3cf67e9ae8c3c8b02ca7' 
  AND token = '61ytiecenS6nsDI2kcEXpvLL0s6t/+AvvIINEtPHeW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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