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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56fc5b7096596a231f9124b31bbc450db68401574793e9c54531daa40a1dee30' 
  AND token = '7gxYbZcC+o6C5t9jIHlUfbxDctJgO+aDj+Oaw+wgmAA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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