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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e337c02c080e78986f4acf443811eba2da803d4f5aced80aa591d9b79e5bc92d' 
  AND token = 'x8Z5J/BMa9fF7OzNSD2YiBTNyTmvHJdX+k48ON1xwVc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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