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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8500ca459cd502c5d2428515c4ad67640f65e562ff485c0a4f04cfee5013424c' 
  AND token = 'HQQ6crH4jCifRv7JpHiTI35sELiKIli1dSOppsNc2ww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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