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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf5537f98efaefd146437602d3a80150e964e217e312ff19508879ec0aedc02e' 
  AND token = 'WRoQyI7asjKzZ0DXIi1p/t+kW0O7EiPzMKIOFk00sX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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