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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '335e7d8487e6640dd5967c1da72aaba77e7bf663e23f4a66ce8d0665a3f4f497' 
  AND token = 'ibGWxYsT5oM+izFoguJeuU28kM8X9n2nHGF6g+rp76w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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