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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dedb3f4d8816a2024746b6d45dd924b16254948a7b5ccd8305209a6f63c80f8d' 
  AND token = '8s90qgIGAwvx1ikY4ntgbkcCekXkU425Htdec6bXqKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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