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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f36a2512d159a18b6ffbff05143e7c426f4a7b86827817db1bc965a46a24e7f6' 
  AND token = 'kJDBAvYyQsMzczXhUsdd7/7z9IMiP7kqC10L0J7Z6/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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