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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0a13ab6380c89a1c5c6f0ce6c87bdb587197b7457317d11c845ca420c08a7e1' 
  AND token = 'MjXpVGOVUcJoGcyk86mLvqBYhIrS7WMUWngz6F2+5PU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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