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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cafc13139afe9c2d3e7edc57ad5b6eeb4bd7891c6e66dec267a1b0f61fe9ad4f' 
  AND token = 'ORQ/K5eJhUN8yaLCv1bPJWcZVer61gd0fdWO4KbfVfo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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