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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '013eeacd401fd65baa4fb4d8e5dcc67b4d7dcbba7c57ce3be0286966965c949f' 
  AND token = 'X/yRpD8atb6JC0fqh3g+FF9Utl5Wy+3rnluM7VwVlFI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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