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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edbd55011f08a7fa18042b89ef619670622863fbb6bf0c9402de281e2b907e8c' 
  AND token = 'x43go2CCQtC7w6R/hlFvE3EkJJwk4LKUV+2z9d3Wdh4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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