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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d038afba9c23abe4e7cf61d2d04bdb83c5fb7ca3d51336635ba75104ed8c797' 
  AND token = 'kGP0Vr90EMhdp2X++9HIp6r6g3OURdun9YUGxmXKRuQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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