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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '977e72d95a2f64d7f583aeb9f2ea380921568a8f2a8304866591cf537e20580f' 
  AND token = 'FK2F+KSe+unE2aGzVClQWlQU5R1NwpCRUEE5Prsd9WQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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