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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1be63d7c5bf1d7e8dd2a5514ba0ef09a8f64c2863f1fba575a3f10d80f8b2e68' 
  AND token = '+tVL0LKCvOKsD3Od429mo2o35Fy1PxlDn9mKQ9Oziww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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