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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85fcdb764c9f235831d80a13418cf50223ffb200f80e1f0342ed1f37efca9515' 
  AND token = '5PZS9BnADUvcm58N8tejYMnOfVJ4M4Jk9WzZok0/no4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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