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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7249afa662d451510130c25688c5c3141f17a75df36807c3eff17365cddf6a03' 
  AND token = 'UTgJYcA8leerKFTmVduuh4QWiQ8c3d/8lOjjrrsRzZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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