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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fd1f475879d883ee817d2c65401eac197d5ac95ba6db2c34d2942d9835a3653' 
  AND token = '1BLH/caYN6XvD+Pc3VlPQn5vj56OTeuX0Ob/cvkUYBE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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