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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a82a0b76ac63840a491afd7a529f014e85c69593e87515a58a0536a547c9058c' 
  AND token = 'lTFc8U3iZY2NBPXsMjtAoLRLDS6zcsOxyKdee9QcksA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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