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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '829a3543b39d511696ff03290237fed6616b0c99c4d9cf7ccf9a7c92e9a5096f' 
  AND token = 'ZZmw2sVSjmkpS/obj5U0rcA/tfI6nv4Xd6EZeIfzvi0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00073

JSON explain

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