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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31dc731eb939ee63d433e8be3aabcd88762c77cf196cc9411eb9e6ea79872606' 
  AND token = '5k3G++QvYjAhmcOI7VvaNj8ty95l9ayweKlVurjXJCg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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