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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2870fc950e86bb540159bf97b1a635c137763a879e7103e85f566a3ead103dc8' 
  AND token = '3lBO5+NKvorD1bQmzs34Gc1NMu/LnrzpzeNOhNWAJZw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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