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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b8123c9faa2ee1bbf0c399e13d574b243eb8bf33f6b0d94ccf40af0f8183950' 
  AND token = '8q+GDKzxshx7OoSyD4kawkenSg6vGVlsTFvxoEGAH84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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