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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '151fa10646f52e07030a14612d03f0f31ca84a35735aaf3fd25ee1d9ddd451d0' 
  AND token = 'R1mfgCBrkYhNwuOdqtLC3OeH0XAmSJPo5YqdKTOo5MA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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