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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53552e09565840cd31e3280ead934d34f8bb7f7b3513a03ba39b76882f3614c1' 
  AND token = '247Yxi6i/mAE27rshYlaNIaITkgxR/DtWBxawe0Esus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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