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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '413685bcb6575ff151974ca6122f0272aa43cbc7b25cda2c5914c27ead1c257f' 
  AND token = 'ee89AT8FLoMHid19Ug8I9qGCg8Mw9l45N4Q7Nk85Ww8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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