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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c41d1e54337079b9af3aab949e957ef39e454a844be68b69597d9ff353fca19' 
  AND token = 'GMluYtOIUc+DXq/VbWFmoQWrFyvuduNkU3Nv/lNPgR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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