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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58986b0ac5f4c0a80d02c079de3f9f2dae769c652a4bfd1c0d1fb2a278a7bcca' 
  AND token = 'kZOTBRbhlyycyZFF7VIUxCwtw14/Cle7Zdd8mQhwljk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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