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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd32ed48e935225c1315b6275a6d76167907449bca83595ae0b270a36a4b54dea' 
  AND token = 'lnQ9+zErX1uhG6kOKmnBGF34hoX4AOOykZPKdlaf0iU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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