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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d2753630e8bf494b3e5ac0d3f8a3b2ae7eda95ec61e5e2abaefc0865983e7e8' 
  AND token = 'GDbTY8sTOZmTBgaq572vhkrCWkyCkPRBxkTWBCJXRTI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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