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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c30af750aea68a76a4ba1c572acdc5d57c8d64bf22dcc7d5d59774e710a78847' 
  AND token = '1kaiK1A0DETEjAN52LJ+1opkLzi2KGGVO+pQp8fEb8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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