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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98ea7464fe18c68a340fe98fa644df536358c9a797dc6ddf6a110e5f8e45f0a2' 
  AND token = 'cfZVARmlMtMWTkMWSrFccQo0dHMhuoHkC46ByTaKyJ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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