SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0bd2d9b762f5068255b3e433315ed99a3377327fc709a48d29d531f75217992' 
  AND token = 'ztKwIL/hhiE8ESu1dfYvb/G4xxRbAgz7CLLn2aPugFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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